Spinning centrifuge



y R. KALKBRENNER ET AL I ,43

SPINNING CENTBIFUGE Filed Dec. 20, 1932 59 Fafieff/Q/Kbrenfier, Y ermamr 7067M Patented May 26, 1936 UNITED STATES PATENT OFFICE SPINNING CENTRIFUGE Robert Kalkbrenner,

Toehl,

Breslau, Wuppertal-Eiberfeld, Germany,

and Herman signors to North American Rayon Corporation, New York, N. Y., a corporation of Delaware 4 Claims.

Our present invention relates toimprovements in centrifugal spinning machines used in the maufacturing of artificial silk, threads, filaments and the like and more particularly to a method of and apparatus for the regulation of the speed of the thread guide which is used to lead the. said threads, filaments and the like to the spinning pot.

In the use of centrifugal spinning apparatus, the thread, after being coagulated in a suitable spinning bath, is guided over a take-up roller and into a rapidly rotating pot. The thread collected in this manner is gradually built up in the form of a spinning cake. The thread guides generally consist of a tubular member through which the thread passes and to which a reciprocatory motion is imparted.

Such method of forming and collecting of artificial threads, silk, filaments and the like, although for the most part satisfactory, has been found to result in the production of a rather poor thread cake due primarily to the fact that since the different thread layers are placed quite uniformly, either one on top of the other or side by side, there is a great tendency for the thread to form impervious sections throughout the cake body. These impervious sections are detrimental to the wet after-treatment and rewinding of the thread into yarn packages and the like.

It is, therefore, one object of our present invention to provide an improved apparatus for guiding the formed thread into the spinning cakes so that the thread crossings of the different layers of the cake as it is built up will not be placed either one on the other or side by side.

Another object of our present invention is to provide an improved mechanism for reciprocating, in pot spinning mechanisms, the thread guide, whereby the speed of the reciprocation thereof may be either retarded or accelerated during the building up of the spinning cake so that the thread crossings of difierent layers will not be placed one on the other. Such method of building up the cake body will prevent the formation of matte-like sections which, being impervious to the liquids of the cake, will prevent satisfactory wet after-treatment thereof.

A still further object of our present invention is to provide an improved mechanism which will vary the rotation of the shaft by which the thread guide is reciprocated; such change in rotation varying the speed of reciprocation of the thread guide to such an extent as to prevent the formation of uniform thread crossings in the thread body.

These and'other features of our present invention will become more apparent fro-m a study of the following description in connection with the attached drawing, in which:

Fig. 1 is a semi-diagrammatic view in side elevation of a form of the invention, as used in conjunction with the pot spinning mechanism;

Figure 2 is a sectional view of the driving apparatus disclosed in Figure 1; and

Figure 3 is a sectional detail view taken along the lines 3-3 of Figure 2.

Referring now to the drawing it will be found that like numerals of reference indicate like parts. As shown in the drawing the thread is led into the spinning pot I9 by means of a thread guide tube I0 secured to the holder II. The thread guide holder is secured to a rail I2 to which is pivotally attached lever I5 pivotally connected to its upper end to a bell crank I5 carrying a roller I6 contacting with a cam I3 secured to a cam drive shaft I3.

Reciprocating motion is imparted to the rail I2 and hence to the thread guide tube II) by means of the cam I3 mounted on the shaft I4 and rotated thereby. The rail I2 is operatively connected with the cam I3 through the bell crank I5 carrying a roller I6 which rides against the said cam I3, the other end of the bell crank lever I5 being pivotally connected to the level I6a which in turn is pivotally attached to the rail I2.

In normal operation the rotation of the cam- I3 will impart to the thread guide tube I0 a reciprocating motion which is maintained constant throughout the building up of the spinning cake within the spinning pot.

However, in the invention of applicants the speed of reciprocation of the thread guide tube I0 is varied by means of a novel differential gearing arrangement hereinafter more fully described.

The mechanism embodied to rotate the cam shaft comprises a driving gear 28 secured to a sleeve 29, rotatably mounted on the cam drive shaft. Referring now to Figures 2 and 3, we have shown in detail the construction of the differential for either accelerating or decreasing the speed of rotation of the cam shaft. Gears 28, 3| and 32 are mounted on a sleeve 29 which is rotatably mounted on the cam shaft and are connected with the disk 34 also secured to the cam shaft by means of a slide 35. The slide 35 has secured thereto a bolt 36 carrying a roller 31 positioned in an eccentrically disposed groove formed in gear 3|. As will be noted from an a in a slot formed in the disk 34.

inspection of the drawing, gear 3| is loosely mounted on the sleeve 33. r 7

The lower end of the slide is likewise provided withra bolt 38 carrying a roller 39 which rides Gears 3| and 32 are connected to each other by intermediate 7 gears 4| and 42 of" different size.

In. operation, gear 281s driven by any suitable source of power thereby rotating sleeve 29 i and gear 32. This rotation is imparted to gear 3| through the intermediate gears ill and 4 2; The rotation of gear 3| imparts an up and down 'motion'to slide 35 through the bolt 36. Since the'slide is also connected to thedisk 34 by,

the bolt 3a residing in'the 'siet-fiaftne said disk will be rotated but, however, at a varying speed 7 due to the position of the slot ,40 which, allowing 7 a sliding action of the roller in the slot, will vary the speed of rotation of the disk and hence change the speed of rotation of the cam shaft.

From the above description it will be appreciated that we have'provided a simple and efficient method of and apparatus for building up .spinning cakes whichare free from impervious sections therein, heretofore, found to be frequently present in spinning" cakes and which detrimentally affect the after-treatment and rewinding thereof.

Having nowldescribed the invention, what we 'claim as new is 1. In a centrifugal spinning machine, a spinning pot, a thread guide for leading thread into said pot, a drive for said thread guide comprising a shaft, a cam secured thereto, means operatively connecting saidthread guide to said cam whereby upon rotation of said shaft reciprocatory movement is imparted to said thread guide, and means for varying the speed of rotation of said shaft comprisinga slide, a disk secured to said shaft, means to move said slide, said disk being provided with a slot in which is slidably secured means carried by said slide for rotating said slide at variable speeds.

2. In a centrifugal spinning machine, a spinning pot, a thread guide for leading thread into said pot, means to reciprocate 'saifd thread guide and means to vary the speed of reciprocation of said thread guide including, a drive shaft, a disk securedto said shaft, a slide in operative engagement with said disk, means to move said slide, said disk being provided with a slot in which is slidably secured means carried by said slide for rotating said slide at variable speeds.

3-. ma centrifugal spinning machine, a spinning pot, a thread guide for leading thread into said pot, means to reciprocate said thread; guide,

and means for varying the speed of reciprocation of said thread guide comprising a drive shaft, a disk secured to said shaft, a sleeve rotatably mounted on said shaft, differential gearing mounted on said sleeve, a slide operated by said differential gearing, said slide having means secured thereto for riding in a slot in said for rotating said disk at variable speeds. 7

4. In a centrifugal spinning machine, a spinning pot, a thread guide for leading thread into disk said pot, means to reciprocate said thread guide,

and means for varying the speed of reciprocation of said thread guide comprising a driveshaft, a disk secured to said shaft; a sleeve rotatably mounted on said shaft, differential gearing mounted on said sleeve, a slide revolved and reciprocated by said differential gearing, said slide having means secured thereto for riding in an eccentric slot in said disk whereby said.

disk is rotated at varying speeds.

ROBERT KALKBRENNER; HERMANN TCEI-IL. 

